<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>图书管理</title>
    <style>
        .grid {
            margin: auto;
            width: 530px;
            text-align: center;
        }

        .grid .book {
            padding: 5px 0 10px 0;
            background-color: #f3dcab;
        }

        .grid table {
            border-top: 1px solid #c2d89a;
            width: 100%;
            border-collapse: collapse;
        }

        .grid th,
        td {
            padding: 10px;
            border: 1px dashed #f3dcab;
            height: 25px;
            line-height: 25px;
        }

        .grid th {
            background-color: #f3dbac;
        }

        .grid .total {
            height: 30px;
            line-height: 30px;
            background-color: #f3dbac;
            border-top: 1px solid #c2d89a;
        }
    </style>
</head>

<body>
    <div id="app">
        <div class="grid">
            <div>
                <h1>图书管理</h1>
                <div class="book">
                    <div>
                        <label for="id">编号：</label>
                        <input type="text" id="id" v-model="id" :disabled="flag" v-focus>
                        <label for="name">名称：</label>
                        <input type="text" id="name" v-model="name">
                        <button @click="handle" :disabled="submitFlag">提交</button>
                    </div>
                </div>
            </div>
            <div class="total">
                <span>图书总数:</span>
                <span>{{total}}</span>
            </div>
            <table>
                <thead>
                    <tr>
                        <th>编号</th>
                        <th>名称</th>
                        <th>时间</th>
                        <th>操作</th>
                    </tr>
                </thead>
                <tbody>
                    <tr :key="item.id" v-for="item in books">
                        <td>{{item.id}}</td>
                        <td>{{item.name}}</td>
                        <td>{{item.date | format('yyyy-MM-dd hh:mm:ss')}}</td>
                        <td>
                            <a href="" @click.prevent="edit(item.id)">修改</a>
                            <span>|</span>
                            <a href="" @click.prevent="del(item.id)">删除</a>
                        </td>
                    </tr>
                </tbody>
            </table>
        </div>
    </div>
    <script src="../vue.min.js"></script>
    <script>
        //自定义指令 获取焦点
        Vue.directive('focus', {
            inserted: function (el) {
                el.focus();
            }
        })
        //处理时间格式过滤器
        Vue.filter('format', function (value, arg) {
            function dateFormat(date, format) {
                if (typeof date === "string") {
                    var mts = date.match(/(\/Date\((\d+)\)\/)/);
                    if (mts && mts.length >= 3) {
                        date = parseInt(mts[2]);
                    }
                }
                date = new Date(date);
                if (!date || date.toUTCString() == "Invalid Date") {
                    return "";
                }
                var map = {
                    "M": date.getMonth() + 1, //月份 
                    "d": date.getDate(), //日 
                    "h": date.getHours(), //小时 
                    "m": date.getMinutes(), //分 
                    "s": date.getSeconds(), //秒 
                    "q": Math.floor((date.getMonth() + 3) / 3), //季度 
                    "S": date.getMilliseconds() //毫秒 
                };

                format = format.replace(/([yMdhmsqS])+/g, function (all, t) {
                    var v = map[t];
                    if (v !== undefined) {
                        if (all.length > 1) {
                            v = '0' + v;
                            v = v.substr(v.length - 2);
                        }
                        return v;
                    } else if (t === 'y') {
                        return (date.getFullYear() + '').substr(4 - all.length);
                    }
                    return all;
                });
                return format;
            }
            return dateFormat(value, arg);
        });

        var app = new Vue({
            el: '#app',
            data: {
                submitFlag: false,
                flag: false,
                id: '',
                name: '',
                books: []
            },
            methods: {
                handle: function () {
                    if (this.flag) {
                        //编辑操作
                        this.books.some((item) => {
                            if (item.id == this.id) {
                                item.name = this.name;
                                return true;
                            }
                        });
                        this.flag = false
                    } else {
                        //添加图书
                        var book = {};
                        book.id = this.id;
                        book.name = this.name;
                        book.date = '';
                        this.books.push(book);
                    }
                    //清空表单
                    this.id = '';
                    this.name = ''
                },
                edit: function (id) {
                    this.flag = 'true';
                    // console.log(id);
                    //根据id查询出要编辑的数据
                    var book = this.books.filter(function (item) {
                        return item.id == id;
                    })
                    //把获取到的信息填充到表单
                    this.id = book[0].id;
                    this.name = book[0].name
                },
                del: function (id) {
                    //删除图书
                    // var index = this.books.findIndex(function (item) {
                    //     return item.id == id
                    // });
                    //根据索引删除数组元素
                    // this.books.splice(index, 1)
                    //-----------------------------
                    //方法二：通过filter方法进行删除
                    this.books = this.books.filter(function (item) {
                        return item.id != id;
                    })
                }

            },
            computed: {
                total: function () {
                    //计算图书总数
                    return this.books.length
                }
            },
            watch: {
                name: function (val) {
                    //验证图书是否已存在
                    var flag = this.books.some(function (item) {
                        return item.name == val;
                    });
                    if (flag) {
                        this.submitFlag = true;
                    } else {
                        this.submitFlag = false
                    }
                },
                id: function (val) {
                    //验证图书是否已存在
                    var flag = this.books.some(function (item) {
                        return item.id == val;
                    });
                    if (flag) {
                        this.submitFlag = true;
                    } else {
                        this.submitFlag = false
                    }
                }
            },
            mounted: function () {
                //该生命周期钩子函数被触发时，模板可以使用
                //一般此时用于获取后台数据，然后把数据填充到模板
                var data = [{
                    id: 1,
                    name: '三国演义',
                    date: 2525609975000
                }, {
                    id: 2,
                    name: '水浒传',
                    date: 2525609975000
                }, {
                    id: 3,
                    name: '西游记',
                    date: 2525609975000
                }, {
                    id: 4,
                    name: '红楼梦',
                    date: 2525609975000
                }, ];
                this.books = data
            }
        })
    </script>
</body>

</html>